Hydraulic pump



B. F. SCHMIDT HYDRAULIC PUMP Nov. 3, 1953 Filed March 24, 1949 2 Sheets-Sheet 1 IN V EN TOR. IA//AM/A/ i .inw/w' O \\\U\ O O n o Q o o /1 L IIJI- \|NN W H\\|l/ M .rw /l /l P \v l l I /ll A f L L lll ff M mw O wm lllll lllhwr llllll N O NOV. 3, 1953 B, F sCHMlDT 2,657,636

HYDRAULIC PUMP Filed March 24, 1949 2 Sheets-Sheet 2 Fla. 2

INVENTOR. l mf/www 55m/war BY Patented Nov. 3, 1953 PAT EN T 0F FLCE;

mgmt-Uno PUMP B gniemin Schmidt, Los Angelea Calif;

Application. March 24, 1949,` kSerial N 8.352,68;

6 Claims. 1 2

Thisjinvention-relates to a pumping system pare tiular-ly designedfor pumping rotary mud` and other slurr-ies.`

Ingeneralhthe objectof Amy invention isV the provision of a pumping systglemwhereinV one or more pumps yor the eXDI'lsible chamber typ?Y iS or are alternately subjectedto superatmospheric and subatmosplier-icY pressure created within a closedlworking 'medium circuit including a Vfluid working medium o ontinena working medium pump, acombination huid-motor and meter, and automatie valve actuatedby the fluidmotor and-'serving to cpntrolthe cycleuoi yoperation of th eX-pansble' chamber une pumps .in response in* "measured, 'qalriiiea Of" WQrkna. medium through the clo, sfd-c,irouit.

fiflfher Obitof, thiefirirenten ,is the` prorif sion f^a newand novel'closed fluid working me-y dium circuit for alternately reciprocatingv the diaphragms 01A two l ormore diaplgragm Y pumps.

"Still another object olf*l this., invention` is n the provision o fY a' new and novel diaphragmH type slurry pump.Y

` The"'i`1jivention possesses other advantageous features,V some oiwh'ich, with the, foregoing, Vwill be' 'Seli ferm ai. length 'ifi the. folleWins,k descrip: tion where that lform ofthe inventionrwhich vhas bl; selected4 for ihlstratinn. the drawings accompanying andfforming ha, part lof 4the present specification is outline, ufinnfull.. In said ldraivings, one' former-th'envention isshown, but it is to beundrtoitliai it is ntzlimitedio Such form sine@ thilveeiigeas Seiforth in the claims may be 'embodiedinaplurality of forms.

Referring to the drawings;v

Fig. l-is a top plan view-of a pumping system embodying the objects ofmy invention.

Fig.4 2is asection-takenon-the line 2---2v of Figi 1, showing .the details of construction .of the diaphragm pump, thel automatic .rotary `valve for controlling the VAopi'arating cycled..thepump,` and the: oignbinatiOnAiuid-motor,and flow meter'iasso-4 gated-w h the rotarrzvalve.

Brlyf the rrlrtrlniiil.a.y existentY shown in these gueslincludes a plurality of identical,` symmetreally arreneedzf diaphragm pumps each pwrided.- with.. a .'.Palrf 0.f chekoralres for cont'rll' gtheingress andfegress of, the.. slurry gfed'feah:providedfw ,aoworkna r Hangar t9; he. Y subject, alternately aime.Srhericy anni, superatmospheric pres.-L Y @common rotary. valve. ammirati@`4 valve, ig in closed; circuit. with acontainer.- for-theiuid working medium, .with

f working medium chamber- I8.

,2, and with a combined fluid motor and meter` having a driving connection with the rotary valve and by which the rotary Valve is made to oper--- ate in response to metered quantities of the working medium throughtlie'system.

More specifically; my pumping system includes a frame generally designated by the reference numeral I and-,on which-issymmetrioally mounted a pluralityofidenticalCdiaplgiragml pumps v2v, 3; 4 and 5; each providedY with a slurryintakeport 6 and with aY slurry outlet-porti.. lilacli-oi the slurry inlet ports 6- is manifolded toa pipe- 8 provided with a angeiorqconnecting it-to a source of the slurryto be pumped.-A Similarly, each of the slurry outlet` ports 'lis-manifolded to a pipe I I provided,withal'connectingilangelI2:

As b est shown in Fig; 2;l eachof-the diaphragm valves 'li includes a valve casing I 3=- having a dishedvcap IIlbolted to tslowerfendf. Clamped between the lower end`5offthe valve-body- IB-and the cap Irl is a perforated, upwardlyv archedy diaphragm retainer- I5A and a rubber diaphragm iserving to dividelthe valvebody anditsap into an upper slurry chamberV IIv and alower Formed in the valve body I3; is a, slurry--intakeboije I9-comg municating at its ,uppgi end Withtheslurry intakeport E5` and vatiijs lower end -with the slurrychamber I 1. Mountedl ywithin thebore I 9 intermediate its ends Ais a valve seat 2I arrangedto receive anl upwardly closing poppet valve 22: The valve 22 isprovided--with a central, upwardly extending guide pin 2-3 receivable in aV sleeve 24 formed integral'with` tl'iedvalve seat ZI; Extending downwardlyfrom the lower face of'et'he valve 22 centrally therewith and as .an integral part thereof, is a cylinder-25=telescopically dis,- posed within the vented'bore of a boss Eli-'c aiseride ing upwardly fromthe diaphra'gm retainer I5.;` Disposed within., the cylinderY 265 andacting against the lower endv of `'the valve 2 2 andl the. upper face of theborevformed in the boss 2,6, `is a spring 2i serving resiliently to urge the valve 22 to its closedposition, Communicating with the slurry outlet-'porti' is a slurry outletbore 28 and mounted withinthis bore isa valveseat 29 in all respects similar to the valve seat'ZI with the Aexception that it faces upwardly'rather than downwardly. Operatively associated with the valve seat 29 is adownwardly closing poppet Valve 3 I identical in alli-,respects to the -poppet valve 22, this valve being resil-ientlyurgedto -itsclosed'. positionv by aY spring -322. accommodated withinV a cylinder 33 `forrredfas an upward `.exten-Y sion of. theyalve-l andwvhieh.t has-telescopic engagement with a vented bore 34 formed in the lower end of a pin 35. The pin 35 is formed integral with a cap 36 serving to close the upper end of the port 28 and provided with a wrench socket 31 by which it can be readily removed. Disposed between the diaphragm retainer I5 and the diaphragm I6 is a coil spring 3B held in place at its upper end by a pin 39 extending through the diaphragm retainer and seated at its lower end on a wear disc 49 cemented to the diaphragm. Recessed in the inner face of the cap I4 in registration with its inlet and outlet port 4| is a diaphragm guard 42.

During the downward stroke of the diaphragm I6, slurry is drawn through the intake port 6 of the valve and past the poppet Valve 22 under the influence of the partial vacuum created as a result of the downward travel of the diaphragm. The slurry which thus fills the chamber I1 above the diaphragm I6 is then forced upwardly 'by the upward movement of the diaphragm, past the poppet valve 3| and through the slurry outlet port 1 into the pipe I I.

Bolted to each of the ports 4I of the diaphragm pump caps I4 is an inwardly flaring conduit 53 and fastened to the inner ends of each of these conduits by a ring 54 is the cylindrical valve casing 55 of a rotary control valve generally designated by the reference numeral 56. Preferably the rotary valve 56 is symmetrically positioned with respect to each of its associated diaphragm valves 2, 3, 4 and 5, as best shown in Fig. l, and is mounted on the frame I.

Journaled in suitable bearings formed in the upper and lower ends of the valve casing 55 and sealed therein in any conventional manner is a shaft 51. Dividing the valve casing 55 intermediate its ends into a pressure chamber 58 and a vacuum chamber 59 is a partition 6| through which the shaft 51 passes and which is sealed therein by packing 62. Keyed to the shaft 51 within the pressure chamber 58 and having a running it with the inner surface of the casing 55 is a cylindrical valve gate 63 formed with a discharge port 64 arranged to establish communication between the pressure chamber 58 and the inwardly flared conduit 53 during each revolution of the gate 63. Keyed to the shaft 51 within the vacuum compartment 59 is a cylindrical gate 65 provided with a port 66, this port being angularly staggered with respect to the port 64 of the gate 63, and arranged to establish communication between the conduits 53 and the vacuum chamber 59 during each revolution of the shaft 51. As a result of this construction each of the working chambers I8 of each of the four diaphragm valves 2, 3, 4 and 5 is sequentially and alternately subjected to the fluid pressure existing within the pressure chamber 58 during the working stroke 0f the diaphragms and to the partial vacuum existing within the vacuum chamber 59 during the downward stroke of each of the diaphragms. Keyed to the upper end of the shaft 51 is a sprocket 61 driven by a chain 63 and which serves to rotate the shaft in response to the flow of metered quantities of working medium through the valve 56 as will be presently explained.

Bolted to an elbow 69 provided on the upper end of the valve 56 is a conduit 1| formed at its outer end with an outwardly flared coupling 12. Bolted to the coupling 12 is a combined fluid motor and flow meter generally designated by the reference numeral 13. The fluid motor and ow meter include a. generally cylindrical casing 14 formed on one side with a circular bulge 15. Journaled on a vertical axis in opposed bearings formed in the lower and upper walls of the casing 14 is a shaft 16 and keyed to the upper end of this shaft is a sprocket wheel 11 serving to drive the chain 68. Bolted to and within the valve casing 14 is a cylindrical cage 18 eccentrically disposed with respect to the shaft 16 and which snugly ts the casing bulge 15.

Keyed to the shaft 16 concentrically therewith is a cylindrical vane carrier 19 provided with radially extending longitudinal slots for the sliding reception of a plurality of vanes 8 I. Disposed between the inner end of each of these vanes and the shaft 16 is a spring 82 serving resiliently to urge each of its associated vanes outwardly so that the outer end thereof has sliding engagement with the eccentric inner surface of the cage 18. As a result of this construction, oil, water or other fluid working medium entering the inlet 84 of the casing 14 exerts a pressure on the vanes 8| and due to the eccentric `disposition cf these vanes and their associated shaft 16 they will be caused to rotate in clockwise direction as viewed in Fig. l. Furthermore, since adjacent pairs of vanes form pockets each of a predetermined maximum capacity which are lled with the working medium during the rotation of the vanes, the shaft rotates at a rate correlated to the flow of metered quantities of working medium through the casing 14 and through the rotary valve 56. It will therefore be seen that the automatic valve 56 operates in response to the flow of metered quantities of working medium through the system, and that consequently the cycle of operation of each of the four diaphragm pumps 2, 3, 4 and 5 is likewise controlled by the ow of metered 1quantities of working medium through the sys- Bolted to an elbow 85 provided on the lower end of the automatic valve 56 and communicating with the vacuum compartment 59 thereof is a conduit 86. The conduit 86 communicates with a closed sump or fluid working medium container 31 which in turn communicates through a conduit 88 with the low pressure side of a conventional working medium pump 89. The high pressure side of the pump 89 communicates through a conduit 9| with the intake 84 of the iluid motor and ow meter 13.

From the above description it will be seen that I have provided a pumping system wherein the cycle of operation of a plurality of expansible chamber type slurry pumps such as a diaphragm pump, is under the control of a common rotary valve, this valve being in closed circuit with a working medium container, a working medium pump and a combined fluid motor and meter serving to actuate the rotor of the control valve in response to metered quantities of working medium flowing through the system and which in turn serves to permit the pump diaphragms to be actuated in response to the predetermined movement of a closed column of working medium.

I claim:

1 A pumping system of the character descr1bed comprising: a iirst pump of the expansible chamber type including a pumping chamber and a working chamber and a pumping element between them; a second pump in closed circuit with a fluid working medium container; a control valve disposed in said circuit, said valve being connected to said working chamber and arranged alternately to establish communication between said chamber and the low and high pressure sides of said second pump; a fluid motor disposed in said circuit between the high pressure side of said second pump and said control valve; and means for actuating said valve in response to the movement of said motor.

2. A pumping system of the character described comprising: a rst pump of the diaphragm type including a Working chamber and a pumping chamber and a diaphragm pumping element between them, said pumping chamber being provided with check valve controlled inlets and outlets; a second pump in closed circuit with a iluid working medium container; a control valve disposed in said circuit, said valve being connected to said working chamber and arranged alternately to establish communcation between said working chamber and the low and high pressure sides of said second pump; a fluid motor disposed in said circuit between the high pressure side of said second pump and said control valve; and means responsive to the movement of said motor for actuating said valve.

3. A pumping system of the character described comprising: a plurality of pumps of the expansible chamber type each including a pumping chamber and a working chamber and a pumping element between them; another pump in closed circuit with a uid working medium container; a valve disposed in said circuit, said valve being manifolded to said working chambers and arranged alternately to establish communication between each of said chambers and the low and high pressure sides of said other pump; a uid motor disposed in said circuit between the high pressure side of said other pump and said f valve; and means for actuating said valve in response to the movement of said motor.

4. A pumping system of the character described comprising: a pump of the expansible chamber type including a working chamber and a pumping element therein; a rotary valve including a cylindrical valve casing provided With a high pressure chamber and a low pressure chamber; a conduit communicating between said working chamber and with said high pressure chamber through a discharge port formed in said casing and with said low pressure chamber through an intake port formed in said casing; and rotary valve gates mounted in said cylindrical casing, said valve gates being arranged to successively open and close said discharge and intake ports.

5. A pumping system of the character described comprising: a pump of the expansible chamber type including a working chamber and a pumping element therein; a cylindrical valve casing divided by a partition intermediate its ends into a high pressure chamber and a low pressure chamber; a first conduit communicating with said working chamber and said high and low pressure chambers respectively through outlet and inlet ports formed in said valve casing; rotary valve gates mounted in said valve casing arranged to successively open and close said outlet and inlet ports; a Working medium pump having its low pressure side in communication with said low pressure chamber and its high pressure side in communication with said high pressure chamber; and means for actuating said rotary valve gates in response to the ow of working medium from the high pressure side of said working medium pump.

6. A pumping system of the character described comprising a pump of the expansible chamber type including a working chamber and a pumping element therein, a closed liquid working medium circuit including a working medium pump, a rotary control valve communicating with said circuit and with said working chamber for alternately establishing, upon rotation thereof, communication between said chamber and the low and high pressure sides of said working medium pump, and a fluid motor disposed in said circuit and connected to said valve for rotating the same.

BENJAMIN F. SCHMIDT.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 33,936 Fitzgerald Dec. 17, 1861 482,840 Booth Sept. 20, 1892 1,301,485 Mueller Apr. 22, 1919 1,666,255 Corey et al Apr. 17, 1928 1,976,040 Scott Oct. 9, 1934 2,276,358 Vickers Mar. 17, 1942 2,402,300 Shimer June 18, 1946 

